Fix #613: Don't store large REF or ALT in vcf.
Fix #613: Don't store large REF or ALT in vcf.

I think this is just a bug in pindel2vcf, but we can apply similar logic
elsewhere (e.g. Lumpy) if it's also a problem there.

churchlab/millstone,churchlab/millstone,churchlab/millstone,woodymit/millstone,woodymit/millstone,woodymit/millstone,woodymit/millstone,churchlab/millstone